1. Put on gloves (otherwish the nails will be dyed grey,although that does not affect health)
2. Make your hair wet with both your hands.
3. Wipe off the water on the hair.
4. Promptly put the shampoo on the hair and rub it until it reaches the bottom of the hairs,then rub the hair for 5-10 minutes so that the shampoo moistens the bottom of each hair.
5. Wash the shampoo away.
6. The hair will become dark and shining.